Surface pre-oxidation device and method for improving steam oxidation resistance of heat-resistant materials

Abstract

The invention discloses a surface pre-oxidation device and method for improving vapor oxidation resistance of a heat resisting material. Ar / O3 mixed gas containing a trace amount of ozone reacts with heat resisting steel or an alloy pipe panel interface at 0-40 DEG C, and the element Cr is oxidized into a dense Cr-rich oxidation film so as to effectively prevent oxygen ions or hydroxide ions from spreading towards the heat resisting steel and an alloy matrix, and prevent metal iron ions from spreading towards the oxide and vapor interface. The device can be applied to surface pre-oxidation treatment of a power station boiler or vapor generator manufacturing plant after pipe bundle or pipeline processing, and can also be applied to surface pre-oxidation treatment of pipe bundles or pipelines of a power station boiler or a vapor generator after assembling but before operation, the pipe bundles or the pipelines do not need to be detached before a unit operates, and cyclic pre-oxidation of inert gas / O3 is carried out only through inlet and outlet collection tanks of superheater or reheater pipe bundles. According to the surface pre-oxidation device and method, the principle is simple, implementation is easy, and the application prospects are broad.

Description

technical field [0001] The invention relates to the technical field of material technology, in particular to a low-temperature ozone surface pre-oxidation device and method for improving the resistance to high-temperature steam oxidation of heat-resistant steel and alloy materials. Background technique [0002] At present, improving the steam parameters of fossil fuel generating units is one of the most effective methods to improve the utilization rate of fossil energy and reduce pollutant emissions. In the practical application of fossil fuel-burning ultra-supercritical generator sets, the main steam pressure and main steam temperature can reach 26-31MPa and 605-623°C, respectively. However, under the condition of high temperature and high pressure, the problem of anti-steam oxidation of high-temperature components of the unit becomes more and more prominent. For example, the tube bundles and pipes in which high-temperature and high-pressure steam flows in power plant boil...

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Problems solved by technology

[0005] Although these methods can improve the steam oxidation resistance of materials to a certain extent, each method has certain limitations, such as: the Cr plating layer formed by the Cr plating treatment in method (1) is easy to It falls off from the surface, so that the base material is directly exposed to high-temperature steam, further accelerating the oxidation process; (2) The shot peening process requires huge surface treatment equipment, and the processing cost is high; (3) The combined addition of Cr, Si, Al and other elements Will cause changes in other properties of the material

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